Chat with Grok 4.5 or create an Agent
Start a direct Grok 4.5 conversation for coding, engineering, and knowledge work, or use the same fixed model to create a private Agent.
Chat with Grok 4.5 or build on it
Open the shared Grok 4.5 Chatbot for a direct conversation, or create a new private Agent with a fixed Grok 4.5 runtime.
Chat now or create an Agent
Start a conversation with the fixed model, or use it to create a private Agent with your own Skill and instructions.
Release and API status
Current public facts from xAI documentation.
Grok 4.5 facts
Use these fields when deciding whether Grok 4.5 fits a private Agent workload.
- Model ID
- grok-4.5
- Context window
- 500K
- Modalities
- Text and image input
- Reasoning
- Supported
- Features
- Functions and structured outputs
- Model weights
- Not publicly specified
Use grok-4.5 for the documented frontier model.
xAI documents a 500,000-token context window.
xAI lists text and image input, with text output.
xAI documents reasoning and configurable reasoning effort in release notes.
xAI documents function calling and structured outputs for Grok 4.5.
xAI documents the API model, not downloadable model weights.
Best-fit Agent use cases
Prioritize software and knowledge-work workflows that benefit from tools and structured output.
Decision evidence
Provider-published facts that matter for Agent selection.
| Dimension | Official evidence | Decision use |
|---|---|---|
| Model positioning | xAI describes Grok 4.5 as its frontier model for coding, agentic tasks, and knowledge work. | Shortlist it for engineering Agents, then test pass rate and correction cost. |
| Tool and structure support | xAI documents function calling and structured outputs. | Useful when the Agent must call systems or return machine-readable results. |
| Long context | xAI documents a 500K context window with higher-context pricing above 200K. | Model cost separately for short and long context workloads. |
Provider positioning is not a benchmark result; run your own acceptance scenarios.
Published API pricing
Rates per 1M tokens from xAI model and pricing docs.
| Model | Input | Output |
|---|---|---|
| grok-4.5 | $2.00 / $0.30 cached | $6.00 |
| grok-4.5 over 200K context | $4.00 / $0.60 cached | $12.00 |
xAI charges higher rates for requests that exceed the 200K context window.
Operational limits
Validate these before production Agent rollout.
Official sources
Primary xAI documentation used for this page.
Grok 4.5 FAQ
Answers about Grok 4.5 online Chat, API pricing, context, availability, and Agent creation.
Use Grok 4.5 for your next task
Start a direct Chat now, or create a private Grok 4.5 Agent for coding, engineering, or research workflows.